To begin, remove the flowers from your lavender stems and place them in the glass jar. Next, add oil to the saucepan and heat gently. You only need to warm this up! After it's warmed up (Not boiling!) add this to the jar. Once filled, place cling film over the top and secure with the elastic band.

Now comes the waiting game. Wait at least one whole month without opening it back up.

After the time has passed, open up your jar and strain the contents into the jar you will be keeping it in. During this, use the spoon to mash up the flowers to give it that extra oomph. (Much like when you mash tea.)